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Da Sahar SToRaY asked Grid Tied inverters? How we can get a constant 208 AC voltage out of inverter when input DC(insolation) is?
varying? For my model, I am getting 500 VAC out of inverter but the grid line is at 208 volts. I am using current control scheme so the inverter is acting as current source but how do i manage to get a 208 volts out of inverter?
And got the following answer:
The voltage of the inverter gets pulled down to the voltage of the grid because the inverter has a very small and limited amout of current that its can supply compared to the current demand of the grid. This is like asking why the ocean level doesn't rise when you spit in it. Look at at this another way, your inverter can only supply a given amount of power to the grid. This finite amount of power depends upon the insolation of the PV cells but for the sake of illustration lets assume your inverter is pumping out 1Kw. Power is Voltage * Amps and you can represent 1 Kw a number of ways 1000V * 1 A 500V * 2 A 250V * 4 A Notice that as voltage drops the current rises so think of your inverter trying to supply the power demands of the grid which is billions if trillions of watts if not larger. Your puny 1Kw inverter cannot make the grid voltage rise to 1000V. Instead the extra voltage the inverter is trying to produce is pushing against the 250V on the grid. But due to the limited amount of power available from the inverter its voltage drops to that of the grid as it the extra voltage it is producing is being used to push current onto the grid. The amount of inverter current to the grid is its power divided by the grid voltage 1000W / 250V = 4 A If your PV cells only produce 500W then your current to the grid will be 2A ( 500W / 250V).